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客户端Cookie中文编程_MySQL

Jun 01, 2016 pm 02:11 PM
cookie var Chinese client programming

Cookie



在Cookie的使用中,我们发现这样一个问题:如果写入Cookie的内容是中文(如用户称呼),用服务器端程序(如ASP
或PHP)读出完全正确,但是用一般的JavaScript或VBScript的读Cookie函数取出的却是一堆乱码。这是一个棘手的问题,
因为在有些情况下,Cookie的内容需要在客户机端用脚本语言读取。如果你写入了中文,得到了一堆乱码,是不是感觉很
别扭呢?解决这个问题,还要从Cookie的存取方式说起。
   我们知道,写入Cookie内容前需要进行escape(十六进制编码),编码时又是以字节为单位的,这就是问题的关键所
在:任何一个汉字都会被拆成两个字节分别编码;而在读Cookie时,unescape又以字节单位解码,因此最后每个汉字都变

成了两个字节的乱码。怎么办呢?ASP或PHP方式能够正确读出,应该是在unescape解码后,又按照unicode编码把其中的汉
字拼了出来。如果这样的话,能不能找到一种变通的方法解决这个问题呢?仔细研究后发现,只要在十六进制codec(编解
码)过程中能够保存汉字信息就行了,因而我们需要再外包一层codec过程,方案如下:

  1.在escape编码前,把Cookie字符串中的每个字符转换为unicode码的字符串形式(用一特殊字符作为字串的分隔
符)。

  2.在unescape解码后,先把所有unicode字串提取出来,再用对应的函数转换为原字符。



  var nArgLen=strArg.length;
  var nCookieLen=document.cookie.length;
  var nEnd;
  var i=0;
  var j;

while (i {
  j=i+nArgLen;
  if (document.cookie.substring(i,j)==strArg)
{
  nEnd=document.cookie.indexOf (";",j);
  if (nEnd==-1) nEnd=document.cookie.length;
  return DecodeCookie(unescape(document.cookie.substring(j,nEnd)));
}
  i=document.cookie.indexOf(" ",i)+1;
  if (i==0) break;
}
  return null;
}

  如果用CGI程序写入中文Cookie,客户端读取。如在ASP里,可以先使用前述的编码函数后,再用response写入,例
如:response.cookies("Name")=CodeCookie("张三")至此,中文Cookie的问题基本解决。若有相关问题,请到
www.coolbel.com/saibai交流。

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